US9753254B2ActiveUtilityA1

Imaging lens assembly, image capturing device, and electronic device

39
Assignee: LARGAN PRECISION CO LTDPriority: Mar 31, 2015Filed: Jul 29, 2015Granted: Sep 5, 2017
Est. expiryMar 31, 2035(~8.7 yrs left)· nominal 20-yr term from priority
Inventors:Hsin-Hsuan Huang
G02B 9/34G02B 13/004
39
PatentIndex Score
0
Cited by
9
References
29
Claims

Abstract

An imaging lens assembly includes, in order from an object side to an image side, a first lens element ( 100 ), a second lens element ( 120 ), a third lens element ( 130 ), and a fourth lens element ( 140 ). The first lens element ( 110 ) with positive refractive power has an object-side surface ( 111 ) being convex. The second lens element ( 120 ) with negative refractive power has an object-side surface ( 121 ) being concave. The third lens element ( 130 ) with positive refractive power has an object-side surface ( 131 ) and an image-side surface ( 132 ) being both aspheric. The fourth lens element ( 140 ) with refractive power has an object-side surface ( 141 ) and an image-side surface ( 142 ) being aspheric.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
       1. An imaging lens assembly comprising, in order from an object side to an image side:
 a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof; 
 a second lens element with negative refractive power having an object-side surface being concave in a paraxial region thereof; 
 a third lens element with positive refractive power having an object-side surface and an image-side surface being aspheric; and 
 a fourth lens element with negative refractive power having an object-side surface and an image-side surface being aspheric; 
 wherein the imaging lens assembly further comprises an aperture stop, wherein no lens element is disposed between the aperture stop and the first lens element; the imaging lens assembly has a total of four lens elements, there is an air gap between every two of the first lens element, the second lens element, the third lens element, and the fourth lens element that are adjacent to each other, a curvature radius of the object-side surface of the second lens element is R3, a curvature radius of an image-side surface of the second lens element is R4, a focal length of the imaging lens assembly is f, a maximum image height of the imaging lens assembly is ImgH, an axial distance between the first lens element and the second lens element is T12, an axial distance between the second lens element and the third lens element is T23, a central thickness of the second lens element is CT2, an axial distance between the object-side surface of the first lens element and an image surface is TL, and the following conditions are satisfied:
   ( R 3 +R 4)/( R 3 −R 4)<0; 
   2.4 <f/ImgH <6.5; 
   −4.0< R 3 /T 23<0;
 
   0.3< T 12/ CT 2<5.0; and 
   0.95 <f/TL< 1.5. 
 
 
     
     
       2. The imaging lens assembly of  claim 1 , wherein the image-side surface of the third lens element being convex in a paraxial region thereof. 
     
     
       3. The imaging lens assembly of  claim 1 , wherein the fourth lens element has the image-side surface being concave in a paraxial region thereof and at least one convex shape on the image-side surface in an off-axis region thereof. 
     
     
       4. The imaging lens assembly of  claim 1 , wherein the third lens element has the object-side surface being convex in a paraxial region thereof. 
     
     
       5. The imaging lens assembly of  claim 1 , wherein the fourth lens element has the object-side surface being concave in a paraxial region thereof. 
     
     
       6. The imaging lens assembly of  claim 1 , wherein the second lens element has the image-side surface being convex in a paraxial region thereof. 
     
     
       7. The imaging lens assembly of  claim 1 , wherein the curvature radius of the object-side surface of the second lens element is R3, the curvature radius of the image-side surface of the second lens element is R4, and a maximum refractive index among the first lens element, the second lens element, the third lens element and the fourth lens element is Nmax, the following conditions are satisfied:
     |R 3 |<|R 4|; and 
   1.50<Nmax<1.70. 
 
     
     
       8. The imaging lens assembly of  claim 1 , wherein the focal length of the imaging lens assembly is f, a curvature radius of the object-side surface of the first lens element is R1, and the following condition is satisfied:
   3.3< f/R 1<8.5. 
 
     
     
       9. The imaging lens assembly of  claim 1 , wherein the focal length of the imaging lens assembly is f, and the following condition is satisfied:
   5.5 mm<f<12.0 mm. 
 
     
     
       10. The imaging lens assembly of  claim 1 , wherein the axial distance between the first lens element and the second lens element is T12, and the central thickness of the second lens element is CT2, and the following condition is satisfied:
   0.4< T 12 /CT 2<3.0. 
 
     
     
       11. The imaging lens assembly of  claim 1 , wherein the focal length of the imaging lens assembly is f, a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, and the following condition is satisfied:
   5.0 <|f/f 1 |+|f/f 2 |+|f/f 3 |+|f/f 4|. 
 
     
     
       12. The imaging lens assembly of  claim 1 , wherein the second lens element has at least one convex shape on the object-side surface in an off-axis region thereof, a sum of central thicknesses of the first lens element, the second lens element, the third lens element, and the fourth lens element is ΣCT, an axial distance between the object-side surface of the first lens element and the image-side surface of the fourth lens element is TD, and the following condition is satisfied:
   Σ CT/TD <0.55.
 
 
     
     
       13. The imaging lens element of  claim 1 , wherein at least one inflection point is positioned on at least one surface of the second lens element, the third lens element, or the fourth lens element, an axial distance between the aperture stop and the image-side surface of the fourth lens element is SD, an axial distance between the object-side surface of the first lens element and the image-side surface of the fourth lens element is TD, and the following condition is satisfied:
   0.65 <SD/TD <1.0. 
 
     
     
       14. The imaging lens assembly of  claim 1 , wherein an entrance pupil diameter of the imaging lens assembly is EPD, a maximum image height of the imaging lens assembly is ImgH, and the following condition is satisfied;
   0.9< EPD/ImgH <2.0. 
 
     
     
       15. An imaging lens assembly comprising, in order from an object-side to an image-side:
 a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof; 
 a second lens element with negative refractive power having an object-side surface being concave in a paraxial region thereof; 
 a third lens element with positive refractive power having an object-side surface and an image-side surface being aspheric; and 
 a fourth lens element with negative refractive power having an object-side surface and an imaging-side surface being aspheric; 
 wherein the imaging lens assembly further comprises an aperture stop, wherein no lens element is disposed between the aperture stop and the first lens element; the imaging lens assembly has a total of four lens elements, there is an air gap between every two of the first lens element, the second lens element, the third lens element, and the fourth lens element that are adjacent to each other, a curvature radius of the object-side surface of the first lens element is R1, a curvature radius of an image-side surface of the first lens element is R2, a curvature radius of the object-side surface of the second lens element is R3, a curvature radius of an image-side surface of the second lens element is R4, a focal length of the imaging lens assembly is f, a maximum image height of the imaging lens assembly is ImgH, a central thickness of the first lens element is CT1, and the following conditions are satisfied:
   ( R 3+ R 4)/( R 3 −R 4)<0; 
   2.4< f/ImgH <6.5; 
   −0.50< R 1 /R 2<0.50; and
 
   3.0<( f/R 1)−( f/R 2)+(( f*CT 1)/( R 1 *R 2))<7.5.
 
 
 
     
     
       16. The imaging lens assembly of  claim 15 , wherein the third lens element has the object-side surface being concave in a paraxial region thereof. 
     
     
       17. The imaging lens element of  claim 15 , wherein the fourth lens element has the object-side surface being convex in a paraxial region thereof and the image-side surface being concave in a paraxial region thereof, and at least one convex shape on the image-side surface in an off-axis region thereof. 
     
     
       18. The imaging lens element of  claim 15 , wherein a half of maximum field of view of the imaging lens assembly is HFOV, and the following condition is satisfied:
   0.20<tan(2* HFOV )<0.90. 
 
     
     
       19. The imaging lens assembly of  claim 15 , wherein the first lens element, the second lens element, the third lens element, and the fourth lens element are made of plastic material, an Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, and the following condition is satisfied:
   20< V 2 +V 3<60. 
 
     
     
       20. The imaging lens assembly of  claim 15 , wherein the curvature radius of the object-side surface of the second lens element is R3, the curvature radius of the image-side surface of the second lens element is R4, and an axial distance between the object-side surface of the first lens element and an image surface is TL, and the following conditions are satisfied:
   |R3|<|R4|; and 
   TL<10.0 mm. 
 
     
     
       21. The imaging lens assembly of  claim 15 , wherein the focal length of the imaging lens assembly is f, and the maximum image height of the imaging lens assembly is ImgH, and the following condition is satisfied:
   2.7< f/ImgH <5.0. 
 
     
     
       22. The imaging lens assembly of  claim 15 , wherein the curvature radius of the object-side surface of the first lens element is R1, the curvature radius of the image-side surface of the first lens element is R2, an axial distance between the first lens element and the second lens element is T12, an axial distance between the second lens element and the third lens element is T23, an axial distance between the third lens element and the fourth lens element is T34, and the following conditions are satisfied:
   −0.30< R 1 /R 2<0.30; and
 
   0< T 12/( T 23+ T 34)<0.60. 
 
     
     
       23. The imaging lens assembly of  claim 15 , wherein the focal length of the imaging lens assembly is f, the curvature radius of the object-side surface of the first lens element is R1, the central thickness of the first lens element is CT1, a central thickness of the second lens element is CT2, and the following conditions are satisfied:
   3.3< f/R 1<8.5; and 
   1.7< CT 1/ CT 2<8.0. 
 
     
     
       24. The imaging lens assembly of  claim 15 , wherein at least one inflection point is positioned on at least one surface of the third lens element or the fourth lens element, an axial distance between the object-side surface of the first lens element and an image surface is TL, a maximum image height of the imaging lens assembly is ImgH, and the following condition is satisfied:
   2.5< TL/ImgH <4.0. 
 
     
     
       25. The imaging lens assembly of  claim 15 , wherein the object-side surface of the second lens element has at least one convex shape in an off-axis region thereof, an effective radius of the object-side surface of the first lens element is Y11, and an effective radius of the image-side surface of the fourth lens element is Y42, and the following condition is satisfied:
   0.7< Y 11 /Y 42<1.8. 
 
     
     
       26. The imaging lens assembly of  claim 15 , wherein a largest distance between every two adjacent lens elements among all the lens elements is a distance between the second lens element and the third lens element, an axial distance between the second lens element and the third lens element is T23, an axial distance between the third lens element and the fourth lens element is T34, a central thickness of the third lens element is CT3, and the following condition is satisfied:
   2.50<( T 23+ T 34)/ CT 3. 
 
     
     
       27. The imaging lens assembly of  claim 15 , wherein a largest distance between every two adjacent lens elements among all the lens elements is a distance between the third lens element and the fourth lens element. 
     
     
       28. An image capturing device comprising:
 the imaging lens assembly of  claim 15 ; and 
 an image sensor. 
 
     
     
       29. An electronic device comprising:
 the image capturing device of  claim 28 .

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